[https://nvbugs/6601574][fix] Clean up leftover disagg server processes between Ray tests - #17632
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Included review availability: Your plan includes up to 12 reviews per rolling hour; 10 remain after this review. WalkthroughThe serving command enables ChangesServing and Ray integration
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to The change improves socket reuse and test startup timing, but its test cleanup may still terminate unrelated host serving or MPI processes; the PR is mergeable with explicit owner awareness of this bounded risk. Possibly related PRs
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In `@tests/integration/defs/examples/test_ray.py`:
- Around line 121-122: Add test_ray_disaggregated_serving and
test_ray_disaggregated_serving_python to the functional QA registration list in
llm_function_core.txt, preserving the existing test naming and list format.
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Inline comments:
In `@tests/integration/defs/examples/test_ray.py`:
- Around line 101-114: Update the cleanup logic around me.parents(),
me.children(), process_iter(), and proc.kill() to catch only the specific
expected psutil exceptions for each operation, such as process termination or
access denial; do not use the broad psutil.Error base class so unrelated cleanup
failures propagate.
- Line 87: Update _cleanup_leftover_servers with type annotations for the ports
and timeout parameters and its None return type, following the types used by the
existing DISAGG_SERVING_PORTS and timeout handling.
- Around line 106-112: Update the process cleanup loop to target only stale
processes owning DISAGG_SERVING_PORTS, rather than matching command lines alone;
identify port owners first, exclude protected processes, and clean each matching
process tree via the canonical cleanup_process_tree() helper. Reuse the existing
popen() and cleanup_process_tree() utilities used by the integration tests.
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…es between Ray tests
A passing Ray disaggregated serving test can leave live trtllm-serve/orted subprocesses behind: the next test's servers then fail to bind ports 8000-8002 and the proxy never comes up ('Disaggregated server failed to start'). SO_REUSEADDR (added on main by NVIDIA#17460) only covers sockets left in TIME_WAIT, not ports held by live processes. Before and after each Ray disagg test, kill stale trtllm-serve/orted processes (only port owners and orphans, sparing unrelated jobs on shared machines and this pytest process's own MPI orted daemon) and wait until the disagg ports stop listening.
Also raise the test's wait_for_server timeout to 300s so it exceeds the proxy's server_start_timeout (180s) and the proxy's own error gets logged before teardown, and remove the waives for nvbugs 6601574/6601575.
Verified on 4xB200: tp2-CPP, tp2-PYTHON, tp1-CPP, tp1-PYTHON pass back-to-back with leftovers present at start.
Signed-off-by: Chuang Zhu <111838961+chuangz0@users.noreply.github.com>
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…7632 PR NVIDIA#17632 removed these two waivers as fixed: examples/test_ray.py::test_ray_disaggregated_serving[tp2] nvbugs/6601575 examples/test_ray.py::test_ray_disaggregated_serving_python[tp2] nvbugs/6601574 The underlying failure is not fixed. Both still fail on DGX_B200-4_GPUs-PyTorch-Ray-1 with "Disaggregated server failed to start within 5 minutes"; the tp1 variants on H100 are unaffected. NVIDIA#17632 was green on its own pre-merge CI (L0 #54328 ran all four cases and passed them), but its tested head was 79 commits behind main (status=diverged, ahead_by=1, behind_by=79), so that result does not cover the tree it merged into. Scanning every L0_Test-x86_64-Multi-GPU build that reported these cases: all runs before NVIDIA#17632 merged show SKIPPED, and the failures begin immediately after. Blocked PRs so far: 08-18 03:34 PT NVIDIA#2772 PR 17813 both FAILED 08-18 16:25 PT NVIDIA#2778 PR 16394 both FAILED 08-18 17:01 PT NVIDIA#2779 PR 17483 both FAILED 08-18 17:02 PT NVIDIA#2366 PR 16951 both FAILED 08-18 17:09 PT NVIDIA#2367 (pr n/a) both FAILED 08-18 18:24 PT NVIDIA#204 PR 16887 _python FAILED 08-18 19:13 PT NVIDIA#205 PR 16394 both FAILED _python[tp2] failed in all seven; [tp2] passed once, in NVIDIA#204. The blast radius grows as PRs pull in main, since a branch keeps the old waives.txt until it merges. Restoring the waivers under their original nvbug IDs unblocks CI while the real fix is worked in NVIDIA#17632. Signed-off-by: Igor Shovkun <igshov@gmail.com>
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Description
A passing Ray disaggregated serving test can leave live
trtllm-serve/ortedsubprocesses behind (the disagg proxy and MPI daemons survive the harness's process-tree cleanup). The next test's servers then fail to bind ports 8000-8002 and the proxy never listens on 8000, so the test reports "Disaggregated server failed to start" (nvbugs 6601574/6601575; confirmed by the CI failure analysis of L0_MergeRequest_PR #53865, which shows leftover server processes right before the failure).SO_REUSEADDR(added on main by #17460) only covers sockets left in TIME_WAIT; it cannot help when the ports are held by processes that are still alive. This PR fixes the live-leftover class on the test side:trtllm-serve/ortedprocesses and wait until the disagg ports stop listening. The kill is scoped to listeners on the disagg ports and orphaned processes, sparing unrelated serving/MPI jobs on shared machines — and this pytest process's own MPI singletonorteddaemon (killing it makes Open MPI abort the whole session).wait_for_servertimeout to 300s so it exceeds the proxy'sserver_start_timeout(180s) and the proxy's own error gets logged before the test tears the process tree down.Verified on 4xB200:
tp2-CPP → tp2-PYTHON → tp1-CPP → tp1-PYTHONpass back-to-back, including with real leftovers present at start.Bugs: https://nvbugs/6601574, https://nvbugs/6601575
Test Coverage
examples/test_ray.py::test_ray_disaggregated_serving[tp1]/[tp2]examples/test_ray.py::test_ray_disaggregated_serving_python[tp1]/[tp2]Stage:
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